Characteristics and U-Pb ages of zircon in metavolcanics from the Kangbutiebao Formation in the Altay orogen, Xinjiang
Characteristics and U-Pb ages of zircon in metavolcanics from the Kangbutiebao Formation in the Altay orogen, Xinjiang
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发表时间：
2000
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通讯作者：
Zhang Jin
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作者：
Zhang Jin
康布铁堡组岩石受绿片岩低角闪岩相变质作用。已报道的同位素年龄均为变质年龄。根据锆石的颜色、晶体形态和U-Pb同位素组成，可将该组酸性火山岩中的锆石分为继承锆石、岩浆锆石、混合锆石（含继承锆石小核）和变质锆石。用单颗粒锆石U-Pb法测得该组火山岩的年龄为407.3± 9.2Ma，属早泥盆世。同时获得了两期变质作用的年龄和火山岩源区的参考年龄。
The rocks of the Kangbutiebao Formation suffered greenschist low amphibolite facies metamorphism. The isotope ages reported are all metamorphic ones. According to the colors, crystal shapes and U Pb isotopic composition of zircons, the zircons in acid volcanic rocks of the formation may be divided into inherited zircon, magmatic zircon, mixed zircon (containing a small core of inherited zircon) and metamorphic zircon. The volcanic rocks of the formation were determined using the single grain zircon U Pb method to have an age of 407.3±9.2 Ma, assigned to the Early Devonian age. Meanwhile the ages of two phases of metamorphism and reference age of the source region of volcanic rocks have been obtained.